Ok it was on the todo list already, so here is a beta for a version of the new test that uses just a single thread
Looks the same as the new web version, but slightly different text on start page, and if you share the graph at the end you can spot difference as it shows a tbbx1 result. The page that does the graph drawing will need some tweaking in the future, but as hinted elsewhere waiting on some other stuff.
These tests are logged under a specific version, hence the random string, so if the consensus is that this does not work then we can exclude from the monthly results. If it does work then after a decent period of data collection will look at how adding a single thread run before or after a multiple thread run.
My own connection non-PlusNet has been showing single thread problems today, so a good day test/code this version. Blames Wimbledon and people streaming while at their office desk.